program
	int a;
	int b;
	
	int x;
	int y;

	
	x := 0;
	while (x < 20) do 
		write x;
		x := x -1;
	od
	write y;
	write x;


/*
	if (x > y) then
		x := -10;
	else
		x := 10;
	fi


	
	write x;
	
	if (x >= 20) then
		write x;
	else
		write x*1;
	fi
*/

end

